Hey there

What I think you're talking about is a 'union'. They are truly a godsend when you need to work on the attached equipment!

The only possible downside is an o-ring issue (i.e. lost, pinched or dryrotted) but those are easily prevented and, even if they happen, the o-rings are inexpensive

I'd throw one on and leave enough room for a coupling between it and the pump, just in case...